It depends on the context. Sometimes pure study is based on factual information and research, making it not purely fictional. But in some cases, it could be presented in a fictional way to make it more engaging.
The Scooby - Doo gang is a great pure fiction team. Shaggy and Scooby are always there for comic relief but also have a knack for stumbling upon mysteries. Fred is the leader who comes up with plans, Daphne is brave and often gets into scrapes, and Velma is the brains of the group, solving the mysteries with her intelligence.